@FLOOD Yes. This is my first installation, and I got the direct version on the official web so it’s supposed to be the newest one. And yes. I tried different browsers. Now, the site still unstoppably loads if I click “sign-in” (the other functions work fine). But after a few F5 attempts, I finally log in my account. So I can use Kaspersky Security Cloud, too. I assume that maybe my registration was delayed at that moment. Now the problem solves itself. @FLOOD @Anton Mefodys @richbuff Thanks for your replies.